Just went into Saindburys for some milk and found this! Have been looking for a car transmitter for some time, and for what you get, this is pretty cheap. About 5 left on shelf when I went (Macclesfield). Not sure if online, but it's £20 on Amazon!
EDIT: Was previously £45 - I know because I ummed and arred about getting it!!
It is an excellent kit to ensure power connectivity no matter indoor or on the go
Compatible with all iPhone models including newest, all iPod models except shuffle
Compatible with all audio devices with 3.5mm audio jack - all iphone models including the newest, all iPod modles, MP3. Includes a FM Transmitter
USB AC Adaptor
USB Car Charger
Sync & Charge Cable
AC Adapter input
100 -240V, 50/60Hz, 180mA
USB car charger input 12 -24V DC
FM Trasmitter frequency range 87.6 0 197.9MHz - power source 3 x AAA batteries (not included)
Length of USB cable 1m.